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to grind this valve in its seat, the plug D lias'to be removed, and 'p box E forms the guide to lkeep the valve in the proper position.

. have one or both gef the` pitmen g g adjustable. adjustable by'malriug it in'two parts, V

, and exact description: thereof, which' will enable others skilled in the-art to p being had to the accompanying drawing, making apart of this specification, 'in which-'- l Figure l represents a longitudinal vertic'a-l section of'my invention, takeninthe plane indicatedby the description.

Lentement Ns vente, dans March 17, 186s.

rursovsusrer insistance-vitres.

tite rlgstult nitriet 1x1-tripa ettnt 33mm uit attingere nf tigt site.

`'1.'0 ALL HWHOM ITMAY CONGEBN:A

p Be it known that I, El B. RnQuh, of JorseyCity, in the county of Hudson, and State of -New Jersey, have invented a new and' improved Steam-Valve;.and Ido hereby declare that the following is a full, clear, make and use the same, reference `lineze'aa'iig. 2. n c

Figure 2 is a horizontal section of the same, the line y y, lig. 1, indicating the plane of section. Similar letters of reference indicatelike parts.` I

This invention relates to a double balance-valve, the two valves of which are so arranged that 'they work .l 'one opposite to the other, and thatthe pressure 'of the steam on one valve is perfectly balanced by that on the`H j other valve.

The nature ci ray-invention, audits peculiaradvantagcs, will be readily understood from the following A represents a shell, made-of cast iron,or arlly the supply-pipe ot' a steam'cylinder, or similar device, V by a horizoutalpartitio, B,'o'n`e end of which turns d'wn and the' othnp, so as other suitable material. This shell isinterposed between and its interior is divided oil' in two compartments, a b,

the induction-opening a*- offthe shell,4wlrereas the compartment b communicates freely with the eduction- Upening 6*, or vz'ce versa. l'.lh'e partition B" is provided with two valves'eats, c c',- which are bevelled oil" in f opposite directions,

one being upright and the other reversed, as clearly shown in'g. 1 of the drawing. C C the vave G being fitted in from' below, and the valve C from above. An aperture, il, in the shell,which is closed by a screw-plug, D, gives a'ehance to introduce the valve C, and the valve .C is introducedthrough an aperture, e', in the top, which is closed by a screw-plug, E', and A this plug serves at the same'time as the stuliing-box for thclstem f of the valve C. Said stem extends fromarethe valves, which correspond -to the seats c c',

'both sides of the valve, and its lower endis-stepped into a socket, g,"cast solid with or otherwise formed at the proper spot in the shell;

By means of this step the valve-C is guided while grindin'g it in, and the oper. ation of grinding is thereby considerably faeiliintted, The stem f o'f the valve C is stepped into a socket, g, formed in the centre of.` the screwplug'D, and it extends upward through the stuih'ng-box E, so that, in order during the operation of grinding, the stalling The-vnlveestems ff connect, by rods or pit men gy', with the opposite ends of a.y working-lever, F, the {hierhin-pin h of which' has its bearings in the forked end of a standard or column, G, rising from the shell A; A handlcver, Il,- which is iirmly connected p to one end of the fulcrum-pinh, serves tovopen and close the valves C C', and this hand-lever is provided with a circular slot, t',`to catch over the stud j, which projects from the standard G, and which is furnished with a thumb-nut, 7c, whereby the handlever can be held in any desired position. l

In order to be ablel to adjust the two valves so, that they will close simultaneously, it is indispensable tu In the drawings, I have represented the pitmun y, being one of 'which is pro-vided with atx-ight-handed and the other with aloftlf the valve C is firmly closed, the valveC can be readily proper direction, and if the valve C should close in handed screw-thread, screwing into the barrel-nut l. brought up to its seat by turning the barrel-nut in the advance of the valve C', the b'arrelnut has 'to be `turned back until both valves close precisely at the same llomen't. The hand-lever H may either operated by hand, or it may be connected byr the governor, or to .#'u eccentric or other mechanism used for opening or closing the steam-valve, according to thc function in which my valve may be employed. It may either be used in place of an ordinary stop-cock, or ol u watertup, or-in place of the throttle or governor-valve, orlin `place o the slide-valve. It operates perfectly easy and independent of the pressureof the steam', the pressure on one valve being perfectly balanced by that on the other. It requires' very'littie packing-and said packing is easilykept tight.

to 'closethe compartment a at one and the compartment at the ,opposite end, and allow't'lie compartment a to communicate freely with Itis obvious that my valve may be equally used for hotmir engines, or, in fact, in any p ien Where e stop-valve is used.-

I am aware that the valve-chambers of' governor-valves for steam-engines have been willed inte Lwn eempartments and two valves, so ai'mnged that an equal pressure of steam la made Le it on euwh vulve, thereby equally balancing them, but :1s this forms no pm't of my invention, I (in mit claim it; bu having, thus describe-fi my invention,

I claim as new, und desir to :fecure by Letters Patent- 1. The adjustable pitman g, in cfpmbinatinn with the working-lever I, shell A, and valves C C', eonetrueim? and operating asand for the purpose herein shown and described. l

2. The arrangement of the elote hand-lever H and thumlmlut K with relation to the working-lever if, adjustable valve-stems, and valvea C C', as hel-ein described fon the purpose specified.

. E. 33. RL'QU.

Witnesses:

JAMES P. HALLV GEO. W. Penn. 

